[NIFI-7440] Building NiFi creates unwanted directory

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Tools and Build
• Assignee: Unassigned
• Reporter: Matt Burgess
• Created: 11/May/20 20:49
• Updated: 11/May/20 20:49

Description

When the Hive 3 bundle is built in NiFi, a directory named `${project.basedir}` gets created wherever the Maven command is run from (so the top level during a full build).

This is caused by the version of Hive 3 used by NiFi, which in turn has a dependency on HBase version 2.0.0-alpha4. This version suffers from HBASE-21005 which causes the issue. Hive 3 likely hasn't upgraded their version of HBase because of breaking changes between 2.0.0-alpha4 and 2.0.2 (the first release with a fix for HBASE-21005).

We could override the version of HBase for the Hive 3 components, but one of the breaking changes is the Base64 implementation, which may generate different encodings/decodings and possibly break existing HBase-backed Hive tables. It is more prudent to track the upgrade path (from the NiFi perspective) in this case, revisiting when the HBase version has been upgraded in Hive 3.